MP26121 [MPS]
28V, 1A Li Linear Battery Charger with 10% Battery-Full Threshold and Flexible NTC Interface;
| 型号： | MP26121 |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 28V, 1A Li Linear Battery Charger with 10% Battery-Full Threshold and Flexible NTC Interface 电池 |
| 文件： | 总11页 (文件大小：775K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP26121
28V, 1A Li + Linear Battery Charger
with 10% Battery-Full Threshold
and Flexible NTC Interface
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP26121 is a linear, high-performance
single cell Li-Ion/Li-Polymer battery charger. By
integrating high voltage input protection into the
charger IC, the MP26121 can tolerate an input
surge up to +28V.
•
•
•
•
•
•
•
•
•
•
•
•
Interfaces to Many NTC Resistor Values
Proprietary VIN Surge Protection up to 28V
Programmable Charge Current up to 1A
1% Voltage Accuracy
10% Battery-Full Threshold
No Reverse Blocking Diode Required
Intelligent Thermal Management
Trickle Charge
7V Input OVP
Auto Recharge
Charge-Timer
Fault and Charge Status Indicators
The device features constant current (CC) and
constant voltage (CV) charging modes with
programmable charge currents (200mA to 1A),
current blocking, and trickle charge. The device
also provides fault and charge status
indications to the system.
For guaranteed safe operation, the MP26121
reduces charge current when the device
reaches high temperature (due to limited PCB
space). Other safety features include battery
temperature monitoring and programmable
timer to complete the charging cycle.
APPLICATIONS
•
•
•
•
•
Cell Phones
Digital Cameras
Smart Phones
PDAs
The MP26121 is available in 10-pin 3mm x
3mm QFN packages.
MP3 Players
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
1
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
PACKAGE REFERENCE
ABSOLUTE MAXIMUM RATINGS (1)
IN to GND.......................................–5V to +28V
ACOK andCHG Maximum Sink Current........20mA
All Other Pins to GND..................-0.3V to +6.5V
Junction Temperature...............................140°C
Lead Temperature....................................260°C
Storage Temperature ..............–65°C to +150°C
Recommended Operating Conditions (2)
Nominal Supply Voltage VIN............ 3.5V to 6.5V
Operating Temperature .............–40°C to +85°C
1
2
3
4
5
10
9
8
7
6
Thermal Resistance (3)
θJA
θJC
3x3 QFN10 .............................50...... 12... °C/W
Part Number*
Package
Temperature
QFN10
(3mm x 3mm)
Notes:
MP26121DQ
–40°C to +85°C
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper. The
exposed pad must be Soldered to a ground plane
For Tape & Reel, add suffix –Z (e.g. MP26121DQ–Z)
For RoHS compliant packaging, add suffix –LF
(e.g. MP26121DQ–LF–Z)
*
ELECTRICAL CHARACTERISTICS
VIN = 5V, VSHDN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
Max
Units
SHDN = High
ISUPPLY
40
µA
Supply Current
SHDN= Low, ICHG = 0A,
200
4.20
515
µA
V
VBATT=4.1V
Battery Voltage Regulation
VBATT T = –5°C to +75°C, IBATT = 0
4.16
448
4.24
582
Constant Current
Regulation
VIN = 5V, VBATT = 3.8V
RCHG = 3.3kΩ
ICHG
mA
VIN = 5V, VBATT = 3.8V,
TJ = 0°C to +120°C,
RCHG = 1.6kΩ to 8.0kΩ
(4)
Constant Current Variation
87
100
113
%ICHG
(4)
(4)
End of Charge Threshold
Trickle Current
IBF
7.5
5
10
10
12.5
15
%ICHG
%ICHG
V
VIN = 5V, VBATT = 2.3V
Trickle Threshold Voltage
Trickle Voltage Hysteresis
2.45
2.6
100
2.75
mV
6.7
1.5
7
2
7.3
2.5
V
V
ACOK
Input
Input
Up Range
ACOK
Low Range
ACOK
and
Over-
CHG
VZ
8.2
V
voltage Clamp
Input Over Voltage
Protection
OVP VIN Rising
6.7
7
7.3
V
OVP Hysteresis
400
mV
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
2
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, VSHDN = 0V, TA = +25°C, unless otherwise noted.
Parameter
Symbol
Condition
Min
Typ
Max Units
SHDN Trip Threshold High
SHDN Trip Threshold Low
SHDN Pull up Current
2.6
V
0.4
V
ISHDN
VSHDN=3V
6
µA
Pin Voltage = 0.4V
8
mA
µA
CHG ACOK
,
Sink Current
Battery Reverse Current to
BATT Pin
SHDN = Low and Input = Floating or
0V
1
VBATT = 3.8V, RCHG = 6kΩ. Current
drop 10%
Dropout Voltage
VIN-VBATT
0.25
120
4.0
V
°C
V
Die Temperature Limit
105
3.9
135
4.1
Recharge Voltage
Threshold
VRECHARGE
Recharge Voltage
Hysteresis
100
mV
NTC Upper Threshold
VNTC_UP
VIN=5.00V, NTC pin voltage rising
VIN=5.00V, NTC pin voltage falling
2.735
75
V
NTC Upper Trip Hysteresis
NTC Lower Threshold
mV
V
VNTC_LOW
1.197
20
NTC Lower Trip Hysteresis
Oscillation Freq
mV
Hz
µA
µA
CTMR = 2.2uF
VTMR=0.1V
VTMR=1.5V
5
TMR Pin Source Current
TMR Pin Sink Current
ITMR1
ITMR2
20
20
From Trickle to 90% Full Current,
CSS=0.1µF
Soft Start Time
80
mS
Notes:
4) ICHG is the target preprogrammed charge current (Die temperature below 110°C).
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
3
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
PIN FUNCTIONS
Pin #
Name
Description
1
2
VIN
Input Supply Pin. VIN receives the AC adapter or USB supply voltage.
Open-Drain Fault Status Indicator. This pin is high under any fault conditions.
ACOK
CHG
Open-Drain Charge Indicator. This pin is low during charging, is high after battery full
or termination, and is toggling when the battery is in fault condition.
3
4
5
Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set
the oscillator period.
TMR
GND, Exposed
Pad
The exposed pad and GND pin must be connected to the same ground plane.
6
7
SHDN
SS
Charger IC Enable. An input “Low” signal at this pin or pin floating will enable the IC.
Soft-Start. Connect a capacitor to ground to set the soft-start time.
Constant Charge Current Program Pin. Connect this pin to an external resistor to
program the charging current in CC Mode.
8
ISET
Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a resistor RT1 from
this pin to VIN pin and a resistor RT2 from this pin to GND in parallel with the NTC
resistor (within the battery pack). If NTC function is not used, apply RT2=1/2 RT1.
Do not leave this pin floating.
9
NTC
10
BATT
Charger Output.
BLOCK DIAGRAM
Figure 1—Functional Block Diagram
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
4
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
TYPICAL PERFORMANCE CURVES
CIN = 4.7µF, COUT = 2.2µF, CSS = 0.1µF, VIN = 5V, TA = +25°C, unless otherwise noted.
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
5
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
TYPICAL PERFORMANCE CURVES (continued)
CIN = 4.7µF, COUT = 2.2µF, CSS = 0.1µF, VIN = 5V, TA = +25°C, unless otherwise noted.
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
6
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
battery full threshold is internally programmed
to be 10% of the ICHG. When the charge current
reaches this threshold, the charger IC will be
automatically turned off.
OPERATION
Input Voltage Range
The MP26121 has built-in input voltage surge
protection as high as +28V. The charger IC will
be automatically disabled when the input
voltage is lower than 3.0V or higher than 7.0V.
The open-drain pin ACOK is used to indicate
an input power good condition (i.e.
3.0V<VIN<7.0V). If the input voltage is lower
than the battery voltage, the IC is also disabled
to prevent the battery from draining.
Charge Cycle (Mode Change: Trickle -> CC->
CV)
Figure 2—MP26121 Typical Charging Profile
Figure 2 shows the typical charging profile for
the MP26121. For a fully depleted battery with a
terminal voltage lower than 2.6V, the MP26121
Automatic Recharge
When VBATT drops to 4.0V, the charger will
automatically restart the charge cycle until the
10% ICHG condition is met again. When the input
adapter is unplugged, or the charger is disabled
and/or terminated, the leakage current from the
battery to the MP26121 is less than 1uA.
will
start
with
the
trickle
charge
(preconditioning) at 10% of the full charge
current based on the value of RCHG. If the
charger stays in trickle mode longer than 32768
cycles, CHG becomes high impedance,
indicating a battery fault. After the battery
voltage reaches 2.6V, the charger begins
charging using the programmed charge current
(ICHG).This is referred to as Constant Current
(CC) mode. Once the battery voltage reaches
4.2V, the charger will operate in the constant
voltage (CV) mode until the battery is fully
charged. The charge current drops during CV
mode, and the battery full indication is set when
the charge current is reduced to 10% of the
programmed constant current value (ICHG). The
charge process is then terminated. Recharge
will start after the battery voltage is reduced to
4.0V. After 262144 cycles of continuous
charging, if the battery still has not reached
10% of the ICHG condition, the on-chip timer will
terminate the charger to prevent charging the
dead battery excessively and the fault condition
Programming of Charge Current and Battery
Full Current
The charge current (ICHG) is set by a resistor
(RCHG) connected from the ISET pin to GND.
The relationship between the charge current
and the programming resistance is established
by the following table and graph.
Table 1—RCHG and ICHG Relationship
RCHG (kΩ)
1.65
1.82
2.05
2.32
2.74
3.3
ICHG (mA)
1000
900
800
700
600
500
4.12
5.6
400
300
will be flagged by flashing the CHG LED.
8.45
15
200
100
Charge Termination
The charge current will gradually decrease in
CV mode as the battery approaches full. The
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
7
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
Timer Operation
The TMR pin is used to set the internal
µF
CTMR
oscillator frequency, FOSC = 11Hz×
. The
on-chip timer will start to count down after initial
power-up or every time it is enabled. This timer
will limit the max trickle-charge time to 32768
internal oscillating cycles. If the charger stays in
trickle mode for longer than 32768 cycles, it will
be terminated and a fault will be set by floating
CHG pin. After fault reporting, the charger can
be re-initiated only by recycling the power
supply or SHDN signal. If the charger
successfully goes through trickle charge within
the allowed time limit, it will start CC charging
and then CV charging. If the total charge time
exceeds 262144 cycles and the battery full has
not been qualified, the charger will be
terminated and a fault will also be set by
flashing CHG pin at the rate of half the internal
oscillation frequency. This function prevents
charging a dead battery for prolonged duration.
The timer function can be disabled by shorting
TMR to ground.
Figure 3—Charge Current vs. 1/RCHG
Resistance
The recommended resistance for programming
the charge current is 2.3kΩ<RCHG<11kΩ. The
open-drain pin CHG is used to indicate
charging status. When the battery full condition
is met or any other condition prevents the
charger from charging, CHG will become a
floating pin.
Charger Status Indication
SHDN = High Vin
Battery Full
HIGH
Time out Fault Ambient Temperature Fault
In Charging
LOW
Fault
HIGH
Toggle
HIGH
CHG
ACOK is LOW while 3.0V<VIN<7V, otherwise it is HIGH.
Thermal Protection
Negative Thermal Coefficient (NTC) Thermistor
The MP26121 has a built-in NTC resistance
window comparator. If configured as the typical
application circuit as indicated in Figure 1, the
MP26121 can fit most types of NTC resistors
with two extra programming resistors.
The MP26121 has proprietary thermal
protection to prevent the IC from overheating.
When in thermal protection mode, the average
charge current will be reduced to prevent the IC
from overheating. Operating in thermal
protection mode will slow down the charging
process. Lowering the input voltage and
RTI and RT2 values depend on the type of NTC:
enhancing
thermal
dissipation
to
the
0.308× RNTCH × RNTCL
RT2 =
environment can effectively prevent the IC from
going into thermal protection mode.
0.108× RNTCL − 0.416× RNTCH
RT1 = 0.828×
(
RT 2 // RNTCL
)
For example, for the EWTF03-103 J31 H NTC
resistor, the valid charging temperature range is
from 0°C to 50°C. The MP26121 will cease
charging if RNTC<4.161kΩ or RNTC>27.285kΩ
with RT1= 11.536kΩ and RT2=28.554 kΩ.
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
8
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
Under full charge conditions, certain systems
so that the system can properly indicate full
charge conditions to the user. A simple solution
may draw a very narrow current pulse that
exceeds the IBF threshold. The CHG indicator
may glitch. It is desirable to blank the CHG glitch
is to add a RC filter on the CHG pin to filter out
the possible CHG glitch, as shown in Figure 4.
Figure 4—Filtered Charge Status with GPIO Connection
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
9
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
Power-On Reset (POR) feature can be applied to
modes of the MP26121. CVC and CCC stand for
“constant voltage charge” and “constant current
charge”, respectively.
the MP26121 to ensure that the device starts
operating in a known state. The flow chart in
Figure 5 describes the conditions and operation
Figure 5—Flow Chart of Operation
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
10
MP26121 – +28V, 1A Li+ Linear Batt Charger with Flexible NTC Interface
PACKAGE INFORMATION
QFN10 (3mm x 3mm)
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP26121 Rev. 0.9
9/15/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
11
相关型号：
MP26121DQ
28V, 1A Li Linear Battery Charger with 10% Battery-Full Threshold and Flexible NTC Interface
MPS
MP26123DR-LF
Power Supply Support Circuit, Adjustable, 1 Channel, 4 X 4 MM, ROHS COMPLIANT, MO-220VGGC, QFN-16
MPS
MP2612ER-LF-Z
Power Supply Support Circuit, Fixed, 1 Channel, 4 X 4 MM, ROHS COMPLIANT, MO-220VGGC, QFN-16
MPS
©2020 ICPDF网 联系我们和版权申明